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Thread: Is this black algae?

  1. Back To Top    #1

    Join Date
    Jun 2009
    Location
    nyc
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    Is this black algae?

    Does this look like black algae? A week ago, our swg timer malfunctioned so there were 2 days with no chlorine. I've noticed this brownish stuff on the floor but I thought it was dirt. I poured in some pool clarifier 2 days ago so that's why it's clumpy. I'm going to do the overnight fc loss test tonight.

    fc: 7
    cc: 0
    tya: 50
    cya: 0
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    Intex Ultra Frame Metal ABG Pool 16' round x 48"
    4000gph intex filter pump hooked up to 1500gph filter pump to solar bear 4'x20" solar panel to
    intex swg to pool
    deluxe intex maintenance kit, clearview vacuum head, tf100 test kit

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    Mod Squad Bama Rambler's Avatar
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    Re: Is this black algae?

    Doesn't look like it to me.

    Since you added clarifier, you need to vacuum to waste if you can.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

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    nyc
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    Re: Is this black algae?

    OC FC loss test is 0.5 at night, 0.25 in the morning. The black stuff grew back even though we kept vacuuming it every day.
    Intex Ultra Frame Metal ABG Pool 16' round x 48"
    4000gph intex filter pump hooked up to 1500gph filter pump to solar bear 4'x20" solar panel to
    intex swg to pool
    deluxe intex maintenance kit, clearview vacuum head, tf100 test kit

  4. Back To Top    #4
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,334

    Re: Is this black algae?

    Are you saying that your FC was 0.5 ppm? If it was the test is invalid because your FC should never be that low to begin with.

    You need to perform the shock process until you pass the OCLT.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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